The elevation at which it gets difficult for Matt to breath is higher than 1600 meters.
Which means Matt should stay below the height of 1600 meters. Now the height should be less than 1600 meters for Matt.
As we stated above that 'h' (height) should be less than 1600 meters, that means:
[tex]h<1600[/tex]
Therefore, the inequality to represent the height (h) less than 1600 meters is [tex]h<1600[/tex].